detect scroll up or down jquery for fixed height

scroll.js

		/* SCROLL */
		//Firefox
		$(window).bind('DOMMouseScroll', function(e){
			if(e.originalEvent.detail > 0) {
			 //scroll down	
			 zoomOutTimeline.to(screenToTilt, 10, {scale: 0});
			}else {
			 //scroll up
			 zoomOutTimeline.to(screenToTilt, 10, {scale: 0});
			}
			//prevent page fom scrolling
			return false;
		});

		//IE, Opera, Safari
		$(window).bind('mousewheel', function(e){
			if(e.originalEvent.wheelDelta < 0) {
			//scroll down
			zoomOutTimeline.to(screenToTilt, 10, {scale: 0});
			}else {
			 //scroll up
			 zoomOutTimeline.to(screenToTilt, 10, {scale: 0});
			}
			//prevent page fom scrolling
			return false;
		});